Who the hell are you?

Well I'm not anybody special. I'm a bronzie who seems to circle around B1 with lp as low as 3 and as high as 97. In short I suck at the game. My only request is as follows:

When you comment, refrain from the use of words like viable and optimal. It pains me to see them misused so much in this community.

Why should you listen to me?

You shouldn't. You should listen to math. Just because I can't capitalize on the numbers doesn't mean they aren't right. I run these charts and sheets in excel for a lot of comparisons, is it possible I made a math mistake? The same way I constantly make mistakes in game and throw? Technically yes...stop attacking my pride,that hurts. But I've checked and rechecked (feel free to triple check my numbers). I will admit I use some itemization and spec choices that some might consider "bad" and it inflates the numbers. I also tend to round down or not round at all and take the lowest benefit scenario for comparisons. Which makes it so my numbers and percentages are actually enhancing the differences between what is being compared. I use exact calculations instead of rounding to whole numbers like the game client does. Which further proves the gaps and advantages they provide.

Vlad the bloodman

For some reason you say spell vamp and everybody thinks of this guy. I understand why, he is probably the best example to prove how much spellvamp can heal an AP caster but high healing Vlad is generally low damage Vlad. The main reason being that you would have to have a spell that deals high damage(check), good scaling(check), and a low cooldown(check) however; many cdr items that have AP also include mana which is a useless stat for Vlad. Please note this is a comparison for the highest spellvamp and healing possible scenario, meaning I'm not saying you would replicate this build/rune/mastery set up with success in game. Also note that this sacrifice of damage for healing applies to all AP champions.

Caitlyn the sherrifman

I just want everybody to see what I see in that sheriff skin splash art. Seriously though, the reason I picked Cait is because she has no AS or AD steroids and that makes my job easier. Heck I didn't even factor in her passive, reinforcing my claim about least advantageous comparisons. She also has insane range and therefore safety which is one of my major gripes with most ad carries. In essence I have the epitome of both Lifesteal and Spellvamp.

Runes and Masteries for Vlad

Masteries

1/5

1/5

2/1

4/5

3/1

1/1

3/1

1/1

3/

3/5

1/1

2/5

2/1

3/5

Not getting cdr masteries because the build contains enough to reach cap. just picking up ap and spellvamp where possible.

Runes

Greater Quintessence of Spell Vamp3

Greater Mark of Ability Power9

Greater Seal of Ability Power9

Greater Glyph of Ability Power9

I avoided typical defensive runes even the health ones because the conversion to AP would reduce the base number I had to work with.

Masteries for Cait

Masteries

4/5

4/1

1/5

3/1

2/5

2/5

1/1

1/5

1/5

3/5

2/1

3/5

3/5

Maxing Attack Damage, Attack Speed, Crit and lifesteal. Also not saying this is a "real" page for cait, in fact as I'll prove a little further down this is a low end damage setup for an ad carry, because I purposely skipped Weapon Expertise and Sunder .

Runes

Greater Quintessence of Life Steal3

Greater Seal of Critical Chance9

Greater Mark of Attack Damage9

Greater Glyph of Attack Damage9

The choice here was mostly on the seals, because crit damage makes lifesteal scale ridiculously but crit chance of 33.78 would round to 40% in game and made my 3/10 attacks are crits calculation easier to handle. Again I inflated the attack damage and would suggest you not put this exact rune page into practice because you will be eaten alive.

Spellvamp Damage explination

Spoiler: Click to view

We are going to assume 4 stacks of tides of blood for +8% healing +20% from visage. Total AP with this build is listed at the top of the page as 326.42. We are going to clear Blue. We are going to cast 2 Transfusion and 2 Tides of Blood. Calculated after cooldowns including CDR, health costs, spell vamp from damage and the healing component of Transfusion, total damage dealt with 33% aoe spellvamp reduction for the E.

Attack speed, Crits, and Life steal and Penetration

Spoiler: Click to view

Attack Speed is like CoolDownReduction on crack. 40% cdr cap and a 2.5 AS cap. Right now I don't even know what it would take to get 2.5 AS. but you can "accidentally" get cdr capped with three items. Where the AS cap is so much higher its not even 2pd, zeal, zerker boots, bortk...Maybe I'll do that comparison next.

I am assuming Cait does 2 attacks per second(she actually does more but I can't find her base attack speed I'm just assuming that with a +110% she would have a base attack around 1 so there is a 10% margin of error. Lifesteal is just a percentage of the damage dealt meaning a critical strike increases lifesteal. Critical damage is normally 200% damage with this set up from masteries there is 5% so 205% damage.
Also worth noting is there is no Last Whisper and I skipped the penetration masteries as well as no Infinity Edge which would further increase the damage dealt thereby more lifesteal.

AD damage explination

Spoiler: Click to view

This is assuming nothing but basic attacks, no orb walking just standing and shooting. We will clear Red. It has 20 armor, the highest in the jungle and the same HP pool as Blue. Neither camp has MR. This BT is stacked, the cheat sheet does not count it as stacked.
With a 33.78% crit chance which would round UP in game to 4/10(40%) attacks critting will further inflate the numbers. I calculated for exactly a 33.78% chance meaning every 3rd attack crit on the Elder Lizard. Also calculated for bonus AD on each attack from botrk and the 20 armor reducing dmg dealt.

Cait clears red with crits on little lizards:

Match up

non crits lifesteal is WORSE with spellvamp being 5.36% more healing. However lifesteal does it in 50% of the time.
Crit scenario lifesteal is 20.1% more healing in 40.20% of the time

Why is it like this Cliff?

Well mostly its because the highest ad items also grant lifesteal or crit which benefits lifesteal more than stacking lifesteal. The 33% aoe reduction on spell vamp also kills it, spellvamp gains effectiveness if targets are greater than three. If there was no reduction 66% spell vamp would actually beat 39% lifesteal it would even beat the crit scenario. I could calculate the % difference currently but I've probably bored you enough already. (I lied, here's more numbers to break your brain, non crit is 43.02% better crit scenario is %24.64 better). Just believe me when I say if it was a 20% AOE reduction 66% Spell vamp would seem about equal to 39% lifesteal in healing (only for the crit scenario) but still take twice as long to do it. Thanks for reading and stay tuned if you like theorycrafting I'm currently working on another guide(s).